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Texas Instruments LM2586S-ADJ/NOPB
- Part No.:
- LM2586S-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
- Datasheet:
-
LM2586S-ADJ/NOPB.pdf
- Description:
- IC REG BST FLYBACK ADJ 3A TO263
- Quantity:
- Payment:
- Shipping:
Inventory:632
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Product details
Overview
LM2586S-ADJ/NOPB from Texas Instruments is a monolithic step-up (boost) and flyback DC-DC regulator IC with adjustable output voltage, 4 V to 40 V input range, 3 A NPN internal switch rated for 65 V standoff, current-mode control, and programmable 100–200 kHz switching frequency - used in industrial power supplies requiring wide VIN and multiple-output isolation.
For engineers reviewing the LM2586S-ADJ/NOPB datasheet, LM2586S-ADJ/NOPB pinout, LM2586S-ADJ/NOPB application, or LM2586S-ADJ/NOPB equivalent, key selection considerations include its adjustable reference (1.230 V), ±4% system output tolerance over line/load, external shutdown capability, soft-start function, and compatibility with standard flyback transformers and boost inductors per TI's design guides.
Technical Context
The LM2586S-ADJ/NOPB implements current-mode PWM control with an internal 1.230 V precision reference, error amplifier (670 V/V gain, 3.2 mmho transconductance), and oscillator synchronized via pin 6 or adjusted via pin 1 resistor. It uses NPN switch topology with cycle-by-cycle current limiting and thermal/UVLO protection.
Its functional architecture supports both non-isolated boost and isolated flyback topologies: in boost mode, it regulates output by modulating peak switch current using feedback from a resistive divider; in flyback mode, it controls energy transfer via primary-side current sensing and transformer-coupled secondary regulation - requiring no optocoupler for basic configurations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4 V to 40 V - supports wide-range industrial inputs including 12 V, 24 V, and 36 V rails without pre-regulation. |
| Output Voltage | Adjustable via R1/R2 divider - set by VOUT = 1.23 V × (1 + R1/R2); enables custom outputs from ~1.25 V to >40 V depending on transformer/inductor design. |
| Switch Current Limit | Typ. 4.0 A, min. 3.0 A - provides robust overcurrent protection for 3 A continuous output in boost/flyback designs with external current limiting. |
| Reference Voltage | 1.230 V ±2.2% (min/max) - high-accuracy internal bandgap reference enabling ±4% total system output tolerance across line, load, and temperature. |
| Switching Frequency | 100–200 kHz (adjustable via pin 1 resistor or sync pin 6) - balances efficiency, magnetics size, and EMI performance for industrial power stages. |
| Shutdown Current | Typ. 56 μA (16 μA at VIN + 40 μA at ON/OFF pin) - enables ultra-low-power standby in battery-backed or energy-sensitive systems. |
| Thermal Shutdown | Activates at TJ ≥150°C - protects device during overload or poor heatsinking; requires θJA ≤45°C/W (TO-220) or ≤35°C/W (DDPAK) for full 3 A operation. |
Pinout & Package
LM2586S-ADJ/NOPB is packaged in a 7-pin TO-220 (NDZ) with bent, staggered leads (10.1 mm × 8.89 mm body) and electrically identical 7-pin DDPAK/TO-263 (KTW) variant (14.986 mm × 10.16 mm). Both packages feature exposed metal tab for thermal dissipation and share identical pin functions.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1: FREQ ADJ / ON-OFF | Frequency programming & shutdown control | Resistor-to-ground sets 100–200 kHz; ≥3 V applied shuts down IC - dual-function pin requiring diode isolation for concurrent use. |
| Pin 2: GND | Power and signal ground reference | Common return for internal circuits, switch emitter, and feedback network - must be low-impedance connection to minimize noise and regulation error. |
| Pin 3: OUTPUT | Switch collector output | Drives primary winding of flyback transformer or boost inductor - rated for 65 V standoff and 3 A continuous switch current. |
| Pin 4: COMP | Error amplifier output | Provides transconductance amplifier output (3.2 mmho) for loop compensation - connects to RC network for stability in boost/flyback feedback paths. |
| Pin 5: FB | Feedback input | Senses divided output voltage; compares to 1.230 V reference - determines regulation point and enables precise output setting with 1% resistors. |
| Pin 6: SYNC | External synchronization input | Accepts negative-going pulse to align switching edge with external clock - eliminates beat frequencies in multi-rail systems. |
| Pin 7: VIN | Power input supply | Connects to unregulated DC source (4–40 V); powers internal circuitry and switch base drive - requires local 100 nF ceramic bypass capacitor. |
Key Features
| Feature | Design Value |
|---|---|
| Current-mode PWM control | Enables fast transient response, inherent cycle-by-cycle current limiting, and stable operation across wide input/output ratios in boost and flyback topologies. |
| Internal 1.230 V reference | Provides ±2.2% accuracy over temperature, enabling ±4% total output tolerance without external trimming - reduces BOM count and calibration effort. |
| Programmable 100–200 kHz frequency | Allows optimization of magnetic size (smaller inductors/transformers at higher fSW) and EMI filtering while maintaining >80% efficiency in typical 12 V output designs. |
| Soft-start function | Reduces inrush current during startup by gradually ramping COMP voltage - prevents input rail sag and output overshoot in high-capacitance loads. |
| Integrated protection suite | Combines undervoltage lockout (3.3 V threshold), thermal shutdown (150°C), and current limit (3–7 A) - eliminates need for discrete protection circuitry in ruggedized designs. |
Applications
| Industrial Flyback Power Supply | Automotive Boost Converter |
|---|---|
Use Scenario: Isolated 15 V/1 A auxiliary supply for PLC I/O modules powered from 24 VDC field bus. IC Role / Device Role / Timing Role: Primary-side controller in discontinuous conduction mode (DCM) flyback, regulating output via primary current sensing without optocoupler feedback. Use Value: Eliminates need for secondary-side sensing components; achieves ±4% output tolerance using TI-recommended transformer and 1% R1/R2 divider. | Use Scenario: 13.8 V to 28 V boost converter for automotive infotainment head unit powering display backlight and audio amplifiers. IC Role / Device Role / Timing Role: Non-isolated step-up regulator operating at 150 kHz (RSET = 33 kΩ), driving 15 μH shielded inductor and Schottky output rectifier. Use Value: Maintains regulation during cold-crank (4.5 V input) and hot-idle (18 V input); delivers 2.5 A continuous with <100 mVpp ripple using 470 μF low-ESR output capacitor. |
| Telecom Line Card Power | Test Equipment Auxiliary Rail |
Use Scenario: Dual-output (±12 V) flyback supply on telecom line card with -48 V input and strict EMI limits. IC Role / Device Role / Timing Role: Single-switch flyback controller with synchronous rectification on secondary side; frequency synchronized to system clock via pin 6 to avoid heterodyning. Use Value: Enables deterministic EMI profile and eliminates beat frequencies in dense PCB layouts; achieves >85% efficiency at full load with TI-recommended KTW package and copper pour heatsinking. | Use Scenario: Benchtop test instrument requiring clean, adjustable ±5 V to ±15 V rails from 12 V internal supply. IC Role / Device Role / Timing Role: Adjustable boost regulator (pin 5 feedback network) with external shutdown (pin 1) for remote enable/disable via microcontroller GPIO. Use Value: Provides precise user-selectable output (e.g., 12.5 V ±0.5%) with <56 μA shutdown current - extends battery life in portable test gear. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switching regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2587S-ADJ/NOPB | Same pinout and architecture but optimized for higher efficiency in flyback mode; includes integrated soft-start capacitor discharge path. | Better suited for transformer-isolated designs requiring tighter cross-regulation across multiple secondaries. | Select LM2587S-ADJ/NOPB when designing multi-output flyback supplies where secondary-side loading imbalance is expected. |
| TPS55340RTER | Monolithic 5 A buck-boost controller with integrated 5 A MOSFETs; 3.5 V to 36 V input; fixed 500 kHz fSW; no external NPN required. | Eliminates external switch and base drive complexity but lacks flyback transformer support and adjustable frequency. | Choose TPS55340RTER for compact, high-current non-isolated boost applications where board space and layout simplicity outweigh programmability needs. |
Compared with LM2586S-ADJ/NOPB, LM2587S-ADJ/NOPB offers enhanced flyback-specific features like improved cross-regulation and faster soft-start recovery, while TPS55340RTER trades topology flexibility and external component control for integration density and higher peak current - making each suitable for distinct power architecture priorities.
Availability
LM2586S-ADJ/NOPB is available at Aetrix Electronics and suitable for industrial automation, automotive electronics, and telecom infrastructure requiring stable component supply, long-lifecycle availability, and proven reliability in wide-input DC-DC conversion.
Supply support for LM2586S-ADJ/NOPB includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.
The LM2586S-ADJ/NOPB belongs to TI's legacy wide-VIN switching regulator product line, designed specifically for cost-sensitive, high-reliability flyback and boost power conversion in harsh environments - emphasizing minimal external components, robust protection, and broad operating range.
FAQ
What is the minimum input voltage required for stable operation of the LM2586S-ADJ/NOPB?
The LM2586S-ADJ/NOPB has a recommended minimum input voltage of 4 V, with undervoltage lockout (UVLO) releasing at 3.30 V (typical) and 3.05 V (min). Below 4 V, output regulation may degrade under load; operation below UVLO threshold disables the switch entirely. For cold-crank automotive applications, ensure input stays above 4 V during transients or add hold-up capacitance.
How do I calculate the output voltage setting resistors for the LM2586S-ADJ/NOPB?
Use the formula VOUT = 1.230 V × (1 + R1/R2), where R2 is typically 1 kΩ to 5 kΩ. For example, to set 12 V output: R1 = 1 kΩ × (12 V / 1.230 V − 1) ≈ 8.73 kΩ. TI recommends 1% metal-film resistors for best temperature stability. The LM2586S-ADJ/NOPB datasheet Table 1 lists standard values for common outputs.
Can the LM2586S-ADJ/NOPB be used in a flyback configuration without an optocoupler?
Yes - the LM2586S-ADJ/NOPB supports primary-side regulation in flyback mode using reflected voltage sensing, eliminating the need for an optocoupler in many applications. This relies on accurate transformer turns ratio and snubber design. TI Application Report SNVA225 details implementation methods and stability considerations for the LM2586S-ADJ/NOPB in optocouplerless flyback.
What thermal management is required for continuous 3 A operation with the LM2586S-ADJ/NOPB?
For continuous 3 A output in TO-220 (NDZ) package, maintain junction temperature ≤125°C using θJA ≤45°C/W - achieved with ≥4 in² of 1 oz. copper pour and optional heatsink. In DDPAK (KTW), θJA ≤35°C/W requires ≥1 in² copper area. Derate output current linearly above 25°C ambient; the LM2586S-ADJ/NOPB thermal shutdown activates at 150°C.
Does the LM2586S-ADJ/NOPB support synchronization with external clock sources?
Yes - the LM2586S-ADJ/NOPB supports frequency synchronization via pin 6 (SYNC). A negative-going pulse below 0.875 V triggers alignment of the internal oscillator edge. This allows multiple LM2586S-ADJ/NOPB devices or other compatible regulators to operate at identical switching frequencies, reducing beat frequencies and simplifying EMI filter design in multi-rail systems.
LM2586S-ADJ/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Up, Step-Up/Step-Down
- Output Configuration:
- Positive
- Topology:
- Boost, Flyback, Forward Converter
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4V
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- 1.23V
- Voltage - Output (Max):
- 60V
- Current - Output:
- 3A (Switch)
- Frequency - Switching:
- 100kHz ~ 200kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-263 (DDPAK-7)
LM2586S-ADJ/NOPB FAQ
1.How can I place an order for LM2586S-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2586S-ADJ/NOPB on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LM2586S-ADJ/NOPB reliable?
The price and inventory of LM2586S-ADJ/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2586S-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM2586S-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2586S-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2586S-ADJ/NOPB?
LM2586S-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2586S-ADJ/NOPB order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LM2586S-ADJ/NOPB?
For technical support, including LM2586S-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2586S-ADJ/NOPB requirements.
6.How does Aetrix verify that LM2586S-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2586S-ADJ/NOPB products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LM2586S-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM2586S-ADJ/NOPB?
All LM2586S-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2586S-ADJ/NOPB, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LM2586S-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM2586S-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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